pengyu0929 opened a new issue #646: No such omega callback found for service URL: https://github.com/apache/servicecomb-pack/issues/646 ```java @Override public void compensate(TxEvent event) { Map<String, OmegaCallback> serviceCallbacks = callbacks.getOrDefault(event.serviceName(), emptyMap()); OmegaCallback omegaCallback = serviceCallbacks.get(event.instanceId()); if (omegaCallback == null) { LOG.info("Cannot find the service with the instanceId {}, call the other instance.", event.instanceId()); // TODO extract an Interface to let user define the serviceCallback instance pick strategy Iterator<OmegaCallback> iterator = new ArrayList<>(serviceCallbacks.values()).iterator(); if(iterator.hasNext()) { omegaCallback = iterator.next(); } } if(omegaCallback==null){ throw new AlphaException("No such omega callback found for service " + event.serviceName()); } try { omegaCallback.compensate(event); } catch (Exception e) { serviceCallbacks.values().remove(omegaCallback); throw e; } } ``` 在执行` omegaCallback.compensate(event` 时，如果因为网络的原因没有找到服务实例，alpha认为当方面认为omega已经断开连接了，之后把omega从map中删除，但是omega在这种情况下并不会重连alpha，之后alpha会通过队列一直回调omega的补偿方法，导致一直报错，这种情况正确吗？
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